I think its all about how a developer uses the platform. I have seen numerous Renpy games way worse in all aspects as compared to Lust Epidemic.
That being said, unity if used effectively offers more than any other platform.
The problem with Unity I find is that most people getting into NSFW games haven't got a clue about programming. I use a laptop and it's around 5 years old now, which is a fair number but still, I can still run most AAA games at lowest graphics at a decent framerate.
The way some Unity games on here lag on my system is astounding considering how little there is to them. (I cannot believe that MC's room in The Twist is more demanding that playing The Witcher 3 for example) Renpy and rpgm aren't optimized either since they focus on ease of use but their limitations keep creators in check a bit.